Flyback Converter Standby Power Reduction via Voltage Switching
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Solution Overview
Problem
Flyback power converters consume excessive standby power due to constant output voltage during low load conditions, resulting in significant power loss from the photo-coupler, shunt regulator, and voltage divider circuits.
Innovation Solution
The standby output voltage of a flyback power converter is reduced by switching the reference voltage or the ratio of voltage divider resistors using a sleep mode signal, which decreases the power consumption of these components during standby mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output voltage is maintained constant during standby mode, then the load current can be supplied reliably, but the power consumption of the photo-coupler, shunt regulator, and voltage divider circuits increases excessively
Solution Approach 1:
The patent applies dynamics by making the output voltage adjustable between two states: a first voltage level during normal operation and a second (reduced) voltage level during standby mode. This is achieved through a controller that switches the voltage divider configuration based on load conditions, allowing the system to adapt its power consumption characteristics to match the actual operational requirements.
Solution Approach 2:
The patent changes the voltage parameter dynamically by switching between different voltage divider resistor configurations. During standby mode, the controller adjusts the voltage division ratio to produce a reduced output voltage, thereby reducing the power consumption of voltage-dependent components while maintaining sufficient voltage for essential operations.
2Loss of energy
If the output voltage is reduced during standby mode, then the standby power consumption is reduced, but the voltage must be restored quickly when load increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring multiple voltage divider resistor sets with different division ratios. When a load increase is detected, the controller can immediately switch to the appropriate resistor configuration to restore the output voltage to the required level, eliminating the need for gradual adjustment and ensuring rapid response to changing load conditions.
Data Source
AI summary
An apparatus and method for a flyback power converter reduce the standby output voltage of the flyback power converter by switching the reference voltage provided by a shunt regulator of the flyback power converter or the ratio of voltage divider resistors of the shunt regulator, to reduce the standby power consumption by an output feedback circuit of the flyback power converter, the shunt regulator, and the voltage divider resistors, and thereby improve the power loss of the flyback power converter in standby mode.